Grinding machine



Aug. 12, 1930.

' S. C. PROBERT AL GRINDING IACHINE Filld Jan. 2, 1924 10 Sheets-Sheet I a m Tm; 5/17/16 1 CPmber/ fiez/er/ck J! amber/1 ATTORNEYS Aug. 12, 1930.

S. C. PROBERT T GRINDING IACHINB mu! Jan. 2, 192A 10 Sheets-Sheet 2 INVENTOR' 5/21/14 (IPrc'ber-f f Freder/Z-k J 1 amber/1 A TTORNE Y5 Aug. 12,1930. s, c, B ET AL 1,772,592

. qnnwme maxim! Filod Jan. 2, 1924 10 Sheets-Sheet 3 A ORNEYS PROBERT ET AL 1,772,592

GRIND-1N6 IACHIN! F1104 Ja n. 2. 1924 10 sheets- -sheet 4 Wfd . A ORNEYS Aug. 12, 1930. s. c. PROBERT ET L" 1,772,592

GRINDING MACHINE Filed Jan. 2, 1924 10 Sheet,s-Shet 5 L ATTORNEYS Aug. 12, 1930. s. c. PROBERT Er m.- 1,772,592

GRINDING IAGHINE Filed Jan. 2, 1924 IOFSheetS-Sheet 6 Aug. 12, 1930. s. c. PROBERTET AL 1.772592 GRINDING CHINE F1104 Jan. 2, 1924 llSheets-Sheet 7 A TOEI Y Z'YS Br. WM

Aug. 12, 1930.

s. C. PROBERT ET AL GRINDING IACHINE 10-Sheets-Sheet 8 Filed Jan. 2, 1924 A TTORNE Y3 Aug. 12, 1930. s. c. PROBERTET L 1,772,592

GRINDING cums Filed Jan 2, 1924 10 Sheets-Sheet 1p INVENTOR Patented Aug. 12, 1930 UNITED STATES, PATENT OFFICE SIDNEY C. PROIBERT AND FREDERICK J. LAMBORN, OF DETROIT, MICHIGAN, ASSIGNORS,

BY MESNE ASSIGNMENTS, TO CHRYSLER CORPORATION, A CORPORATION OF DELA- WARE GRINDING MACHINE Application filed January 2, 1824. Serial No. 683,870.

This invention relates to grinding niachines and more particularly to grinding machines for grinding splined shafts or other toothed articles.

In grinding toothed articles having surfaces between the teeth thereof which require grinding, a grinding tool constructed for insertion between the teeth of the article .is employed, and ordinarily asingle tool is successively engaged between the several teeth of the article and applied to the surfaces to grind the same. In the usual machines for performing this operation it has been necessary in shifting the grinding tool from one surface to a succeeding one to move relatively the article and grinding tool bodily away from each other to disengage the tool from the space between two teeth, then to move relatively the grinding tool and article to place the tool in position to engage in the succeeding space between the teeth, and fi nally to move relatively the grinding wheel and article toward each other to engage the grinding wheel in this space. In one method of grinding articles of this kind called form grinding, a grinding wheel is provided whose grinding face is shaped to fit or is complementary tothe surface to be ground, andv the grinding of the entire surface is completed with one pass of the grinding tool. In another method called generative grinding, a grinding wheel is employed in which the grinding face of the wheel is not complementary to or coextensive with the surface to be ground but the grinding wheel and article are moved relatively to carry the wheel over the surface to be ground in a path to develop the desired shape. In an application of Fred. J. Lamborn, one of the pres ent applicants, Ser. No. 623, 328, filed March 7, 1923, is disclosed a method of grinding toothed articles by generative grinding, and the present invention relates particularly to a machine for carrying out this method.

One object of the present invention is to produce a novel and improved machine by.

which splined shafts and other toothed articles may be rapidly, accurately, and efiiciently ground by the generative method.

Another object of the invention is to produce a novel and improved grinding machine by which several surfaces respectively lccated between the teeth of a toothed article may be ground successively without moving relatively the grinding tool and the article to be ground bodily away from each other.

A still further object of the invention is to produce a novel and improved grinding machine by which the surfaces of the valleys between the splines of a splined shaft may be accurately ground in an efficient and reliable manner.

With these objects in view, the invention comprises certain novel and improved features, constructions and combinations of parts hereinafter described and particularly pointed out in the claims, the advantages of which will be readily understood and appreciated by those skilled in the art.

In the form of the invention illustrated in this application, the machine is especially constructed for grinding only the cylindrical surfaces of the valleys between the splines of a splined shaft. It is to be understood, however, that, in its broader aspect, the invention is not limited to machines for performing this particular operation, but that certain features thereof may be embodied with advantage in machines for grinding other surfaces of splined shafts and that certain features also may be applied to machines for grinding other articles.

The invention will be clearly understood from the accompanying drawings illustrating the invention in its preferred form and the following detailed description of the conmechanism for supporting and adjusting the p grinding wheel;

Fig. 5 is a detail view in vertical section iFl lustzatiiig certain of the parts shown in Fig. 6 is a view in vertical section taken substantially on the line 6-6 of Fig. 1 and illustrating particularly the mechanism for reciprocating the work carrying slide;

F ig. 7 is a view partly in front elevation, partly broken away and partly in section illustrating certain of the parts shown in Fig. 6 and certain associated parts;

Fig. 8 is a view partly in elevation looking in the direction of the arrow, Fig. 7, and partly in section illustrating certain of the parts shown in said figure;

Fig. 9 is a view in vertical section illustrating particularly the mechanism for re-. vfiit'ising the movement of the work carrying s e;

Fig. 10 is a sectional view taken substantially on the line 10-10 of Fig. 9;

Fig. 11 is a detail sectional view taken substantially on the line 11-11 of Fig.1 and illustrating particularly the mechanism for ad'usting vertically tli'e grindin wheel;

ig. 12 is a sectional view ta en substantially on the line 12-12 of Fig. 11;

Fig. 13 is a sectional view taken substantially on the line 13-13 of Fig. 12;

Fig. 14 is a view in horizonta section illustrating particularly certain of the driving connections for reciprocating the work carrying slide;

Fig. 15 is a detail sectional view taken substantially on the line 15-15 of Fig. 14;

Fig. 16 is a detail view partly in front elevation and partly in section illustrating particularly the mechanism for supporting and driving the splined shaft;

Fig. 17 is a sectional view taken substantially on the line 17-17 of Fig. 16;

Fi 18 is a plan view illustrating one of the s aft holding centers and the construction for supporting the same;

Fig. 19 is a sectional view taken substantially on the line 19-19 of Fig. 18; v

Fig. 20 is a detail view partly in side elevation and partly in section substantially on the line 20-20 of Fig. 2;

Fig. 21 is a plan view illustrating a truing device for truing up the grindin wheel;

Fig. 22 is a sectional view ta en substantially on the line 22-22 of Fig. 21; and

Fig. 23 is a view partly in front elevation and part1 in vertical section taken substantially on t e line 23-23 of Fig. 22. i

In accordance with the resent invention, a grinding wheel is provi ed, the periphery of which is cut away at one or more points to allow the passa e of the teeth on the article to be groun as the grinding wheel and article are moved relatively'to carry the grinding wheel over the article to develop the desired shape in generative grinding the same. i

In the preferred form of the invention of low shown in the drawingsof this application, the machine is provided with means for su portin a splined shaft in position to groun with its axis substantially parallel with a tangent to the grinding wheel, and with a rotary grinding wheel the eripheral grinding surface of which is pref rably cylindrical, the peripheral portion of the wheel being arranged to extend into the spaces between the splines into contact with the surfaces of the cylindrical portion or valleys to grind the same. Durin the grindin operation, the grinding w eel and she t are rotated relatively to transfer the oint of o ration about the shaft and the s aft and' w eel are moved slowly relatively longitudinally of the shaft to transfer the point of o eration along the axis of the shait. By t is relative movement of the shaft and grinding wheel, the contact point of the wheel with the shaft is caused to travel over the surfaces of the valleys in a helix or spiral pitch. The wheel is preferably of large diameter so that the curve of the surface (if contact of the wheel with the shaft is very gradual and the wheel has a relatively broad path of contact with the shaft. The surface generated, therefore, by the relative movement of the shaft and wheel will be quite smooth and of great accuracy.

In order that the grinding wheel may pass fromone space between the splines on the shaft to the next space during the relative rotation on the wheel shaft without moving apart the shaft and wheel, the wheel is provided with a periphery which is cut away at one or more points 'to allow the splines to pass the periphery of the wheel by a movement of the splines laterally of the wheel. In the embodiment of the invention shown in the drawings, the grinding wheel is provided with a spirally-threaded periphery, the grooves between the threads of which are adapted to receive the splines on the shaft to be ground. In order that the surfaces of the valleys between'the splines may be ground by the grinding wheel without grinding the splines themselves, the rotation of the grinding wheel and the relative rotation of the wheel and shaft about the axis of the shaft are timed so that the lateral faces of the threads on the grinding wheel will not touch the lateral faces of the splines. In the present machine the relative rotation of the grinding wheel and shaft is produced by rotating the splined shaft about its axis in timed relation to the rotation of the grinding wheel, and the relative movement of the shaft and wheel to transfer the point of operation of the grinding wheel a ong the axis of the splined shaft is produced by moving the shaft lon itudinally first in one direction and then in t e opposite direction.

' .The present machine comprises a grinding wheel indicated as a whole at 2 mounted on one end of a shaft indicated at 4 journalled in bearings 6 formed on a carrier plate 8 secured to the frame of the machine. The grindin wheel comprises a disk-shaped sup port in icated at 10 mounted on the end of the shaft 4 to rotate with the shaft. The disk is provided with a rabbeted or notched periphery (Fig. 4) constructed to receive a rin 12 of abrasive material which forms the periphery of the grinding wheel. The ring I 12 is held in position on the disk 10 by means on the shaft are engaged in the grooves between the threads on the grinding wheel and the shaft is rotated in timed relation to the rotation of the grinding wheel to carry the splines on the shaft laterally past the peripheral portion of the grinding wheel without allowing the wheel to engage the splines. The shaft shown in the drawing is reduced at its left-hand end, Fig. 16, and carries on its reduced end a hollow cylindrical clutch member 30 secured to the reduced end of the shaft by means of set screws 33. The clutch member 30 projects to the left beyond the end of the shaft and is provided with recesses which receive projecting fingers on a cooperatin clutch element32rigidly connected. to the riving spindle 34.

The driving spindle 34 is mounted to rotate in bearings 36 formed on a support 38 secured to the work carrying slide 40. The spindle 34 .is arranged to be driven from the driving shaft 42', one end of which is reduced and is inserted in a bore in the left-hand end of the shaft 34 (see Fig. 3), so that the right-hand end of the shaft 42 is supported by the spindle 34. The shaft-42 also is mounted to slide longitudinally through a sleeve 43 arranged to rotate in a bearing 44 formed on a bracket secured to the frame of the machine, the

; shaft being connected to rotate with the sleeve preferably byone or more splines. This manner of mounting the shaft 42 allows the same to move longitudinally in conformity with the movement of the work carrying slide in a direction longitudinally of the shaft being ground. The shaft 42 is connected for longitudinal movement with the spindle 34 by means of a collar 45 fixed to said shaft and rotatable within a member 46 secured to the spindle. The collar 45 is arranged to engage a washer held in place by a collar 47 threaded into the member 46 The spindle 34 is driven from the shaft 42 through a clutch comprising a driven clutch member 46 rigidly secured to the left-hand end of the shaft 34 and a cooperating clutch member 48 mounted on the shaft 42 to rotate therewith and arranged for movement longitudinally of said shaft into and out of engagement with the clutch member 46. This I clutch is engaged when the shaft being ground is in contact with the grinding wheel. The clutch is automatically disenga ed when the work is-moved to its extreme eft-hand position out of contact with the grinding 1 wheel, the disengagement of the clutch permitting the operator to stop the work and remove it from the machine during the continued rotation of the grinding wheel. This is of considerable advantage since the grinding wheel and the parts rotating therewith haveconsiderable momentum and it would require a large amount of time to bring these parts repeatedly to a stop. The clutch member 48 is controlled by means of a clutch lever 50 pivoted at '52 on the slide 40, this lever having a forked armembracing the clutch member 48 which carries rolls engaging in a groove 1n said clutch member. An

other arm on the lever 50 carries a roll 54 for engagement with acontact plate 56 carried by a bracket secured to the frame of the machine. The clutch member 48 is normally held in engagement with the clutch member 46 by the contact of the roll 54 with a con- 1 tact face 55 on the plate 56, which is substantially parallel with the direction of movement of the slide 40. When the work holding carriage is moved to its extreme lefthand position, the roll 54 is carried out of contact with this face of the plate 56 and the clutch member 48 is then disengaged from the clutch member 46 by means of a spring 58 acting on the clutch lever 50. The ground shaft may then be removed from between the centers and another shaft may be inserted in its place. When the shaft supporting carriage is moved back to the right, the roll 54 first engages the inclined face 57 on the contact plate 56, thereby actuating the lever 50 to engage the clutch members 48, 46, after which the roll is engaged to the contact face 55 to hold the clutch members in engagement.

. As stated above, the shaft 42 which passes 1 through the sleeve 43 is connected to the sleeve by suitable splines, so that it is driven from the sleeve. The sleeve 60 carries a bevel gear 62 meshing with a bevel gear 64 secured to a shaft 66 mounted to rotate in a bearing 68 on the frame. The shaft 66 is, connected by universal joint 70 with an intermediate shaft 72, which in turn is connected by a universal joint 74 with a shaft 76 mounted in a bearing 78 on a bracket secured to the grinding shaft bearings 6. The intermediate shaft 72 may be made up of two or more parts arranged to telescope together to comensate for the vertical adjustment of the racket 78 with the grinding wheel,as hereinafter described. The shaft 76 carries a bevel gear 80 which meshes with a bevel gear 82 mounted on the rear end of the grinding wheel shaft 4.

Through the connections described, the splined shaft being ground is rotated in timed relation to the rotation of the grinding wheel so that the spiral thread on the periphery of the grinding wheel will remain out of contact with the splines engaging between the threads on the wheels The number of teeth on the cooperating clutch mem. bers 46 and 48 are the same as the number splines on the shaft so that the shaft is always driven by the clutch in the proper time relation to the grinding wheel.

As stated above, during the grinding operation the shaft being ground is moved slowly longitudinally with relation to the grinding wheel, first in one direction and then in the opposite direction, to transfer the oint of operation of the wheel along the sha t. This movement of the shaft is produced by reciprocating movements imparted to the work carriage 40. The work carriage consists of a slide mounted to slide upon guides 84 and 86 (Fig. 11) formed on the frame of the machine. The mechanism for moving this slide comprises a rack 88 (Figs. 6 anti 7 secured to the under side of the slide and a gear 90 mounted upon a shaft 92 and meshing with the teeth of the rack. The gear 90 is driven through an intermediate pinion 98 from a gear 94 secured to a clutch sleeve 95 mounted on a shaft 96. The gear 94 is driven from a sleeve 100 journaled in a bearing 102 on the frame through a toothed clutch comprising a clutch member 104 mounted on the forward end of the sleeve and provided with a series of teeth 106 arranged to engage teeth 108 formed on the clutch sleeve 95, which carries the gear 94.

- i The shaft supporting carriage is arranged to be adjusted manually so that the carriage may be located in position for the insertion or the removal of a shaft with the mechanism for rotating the shaft out of operation. This position is such that a shaft placed in position on the carriage will be out of contact with the grinding wheel.

In order to'enable the work supporting can riage to be adjusted manually the clutch sleeve 95 is providedwith a series of clutch teeth 112 arranged to engage the cooperating clutch teeth 114 formed on a clutch member f a shaft 126 (see Fig. 14).

to the shaft 96 to rotate with the shaft but is mounted to slide longitudinally on the shaft. The sleeve is normally located on'the shaft so that it is unclutched from the sleeve 118 lid is clutched to the sleeve 100, and is there ore driven by the latter sleeve.

The mechanism for driving the sleeve 100 is arranged to drive the sleeve first in one direction and then in the opposite direction, the rotation of the sleeve being automatically reversed after a predetermined movement in each direction. Thus a predetermined longitudinal movement in each direction is imparted to the Work holding carriage. The sleeve 100 carries at its rear end a bevel gear 122 meshing with a bevel gear 124 secured to The shaft 126 carries a worm wheel 128 meshing with a worm 130 (see Fig. 15) fixed to a relatively transverse shaft 132. The shaft 132 carries at its forward end a bevel ear 134 (see Figs. 9 and 10) meshing with bevel gears 136 and 138 carried respectively by sleeves mounted to turn loosely on a shaft 140, the gears 136 and 138 being arranged upon opposite sides of'the gear 134. Between the gears 136 and 138 a clutch member 142 is slidably mounted on the shaft 140 and is arranged alternatively to engage a clutch member 144 secured to the gear 136 or a clutch member 146 secured to the gear 138. This clutch member 142 is sp'hned to the shaft 140 to rotate therewith so that it is driven by the shaft and the gears 136 and 138 are arranged to be alternatively driven through this clutch member. The shaft 140 carries a bevel gear 148 secured thereto which meshes with a bevel gear 150 secured to the. forward end of a drlving shaft 152 (see Fig. 14) which carries at its rear end a belt pulley 154 adapted to receive a suitable driving belt, not shown.

As stated above, during the normal operation of the grinding machine, the work supporting carriage is driven for a predetermined distance in each direction longitudinally of the shaft being ground, and its movement is then automatically reversed. The

movement of the carriage is automatically reversed in this manner by mechanism acting automatically to shift the clutch member 142 on the shaft 140. The mechanism for shiftting the clutch member 142 (see Figs. 9 and 10) comprises a sliding frame 156 secured to a rod 158 the ends of which are slidably engaged in suitable bearings in a casing 160 surrounding the reversin mechanism. This sliding frame is provide with a forked arm 162 embracing the clutched member 142, the projecting portions of which arm engage in a groove in the clutch member. Slidably mountedon the rod 158 is a block 164 o eratively connected with a forked arm of a c utch operating lever 166 pivoted at 167 on the frame. The sliding frame 156 is operated from the lever'166 thrqugh the springs 169 and 170 surrounding the rod 158 and interposed between the sliding block 164 and the sliding frame 156. The clutch shifting lever 166 is actuated to shift the clutch by means of oppositely facing stops 172 and 174 mounted on the work supporting slide and arranged to be carried into engagement with aprojection 17 6 on the lever by the movements of the slide. When one of these stops engages the lever 166, the lever is actuated in a direction to shift the clutch member 142 out of engagement with one of the cooperating clutch members and into engagement with the other cooperating clutch member. During the first part of the movement of this leve'r after it engages the stop, however, the

sliding frame 156 is held stationary by the engagement of one of the latch dogs 17 8 and 180 with a projection on the sliding frame,

. is in operation, thereby lifting the dog and releasing the sliding frame 156. The sliding frame is then moved by, the spring, which has been compressed by the clutch shifting lever, to shift the clutch 142 and thereby reverse the direction of movement of the work supporting slide. Thus a quick shifting movement of the clutch member 142 is produced by the comparatively slow movement of the work supporting slide, thereby obviating any tendency to breakage of the teeth of the cooperating clutch members.

The stops 172 and 174 are adjustable longitudinally of the work supporting slide and these stops may be set so that the reversals of the movement of the slide take place at the proper points with relation to the movement of the slide. The provision for adjustment of the stops also enables the movement of the slide to be regulated for spline shafts of different lengths. Each of these stops is mounted on alever 184 (see Fig.9) adjustably piv-' oted by means of a bolt 186 to a block 188 secured to the work supporting slide. The block 188 is adjustable longitudinally of the slide and is secured to the slide by the bolt 186 the head of which engages in an undercut groove 190 in the slide, the bolt having a nut 192 threaded on the forward end thereof. The bolt not only holds the slide 188 in adj usted position on the work supporting slide, but also secures the lever 184 in position with relation to the block. The position of the lever with relation to the block is determined by an abutment screw 194 mounted in the block and arranged to engage a shoulder on the lever. The above construction enables an extended adjustment of the stops longitudinally of the slide and also a comparatively fine adjustment of the stops to be secured.

When it is desired to adjust the work holding carriage b hand, the clutch sleeve 95 is moved forwar 1y to unclutch the sleeve from the sleeve 100 and to clutch the sleeve 95 to the sleeve 118. The mechanism for shifting the clutchsleeve 110 in this manner comprises a yoke 196'mounted on the inner end of a stud 198 and embracing the clutch sleeve, the yoke carrying rolls 200 engaging in a groove in the sleeve. The stud 198 is mounted to slide longitudinally in a suitable bearing in the frame (see Fig. 7) and at its outer end is connected with a lever 202 pivoted at 204, this lever having a handle by which it may be manually operated. The stud 198 is held in either of its two operating positions by means of a spring pressed detent pin 206 arranged to 'engagde in either of two recesses formed in the stu In the operation of the machine above described, starting with the shaft supporting carriage in its left-hand position, Figures 1 and 2, with the clutch members 48 and 46 disengaged, the operator, after having inserted a shaft to be ground between the shaft supporting centers, moves the grinding wheel carriage back to the right by manipulation of the hand wheel 120. When the carriage has been located in position to start the grinding operation, the operator actuates the lever 202 to unclutch the sleeve from the sleeve 118 and clutch the sleeve 95 to the sleeve 100, thereby throwing in the mechanism for reciprocating the shaft supporting carriage. By the rotation of the shaft and by the slow longitudinal movement of the shaft during the grinding operation, the grinding wheel is caused to grind the surfaces of the valleys in a helical path of relatively low pitch. By the rotation of the shaft in timed relation to the rotation of the grinding wheel with the splines in the shaft engaging between the spiral threads on the periphery of the grinding wheel, the splines are caused to pass the wheel successively without touching the wheel.

' After the grinding operation is completed, the operator manipulates the lever 202 to unclutch the sleeve 95 from the sleeve and to clutch the former sleeve to the sleeve 118. The wheel 120 is then operated to move the carriage supporting slide 40 to the left, Figures 1 and 2, to carry the shaft out of range of the grinding wheel, the clutch members 48 and 46 being disengaged when the roll 54 is carried out of contact with the face 55 of the plate 56. This throws out the driving mechanism for the shaft so that the rotation of the shaft may be stopped and the shaft may be released from the supporting centers.

The periphery of the grinding wheel is gradually worn away by the abrasion of the work against the wheel during the grinding operation and also by the action of the truin tool in truing the wheel. The grinding whee and work holding slide are relatively adjustable to carry the wheel toward or from the axis of the shaft to be ground, so that the peri hery of the wheel may be accurately locate inthe proper position with relation to the surfaces of the shaft. In the present form of the invention the grinding wheel is arranged for adjustment with relation to the work holding 8 which carries the bearings 6 for the grinding wheel shaft is attached to a slide plate 208 mounted to slide vertically u on a dovetail ide 210, on the frame of t e machine (see ig. 2). The weight of the slide plate 208 and arts carried thereby is supported by means of a cable 212 attached at one end to the slide plate and passing over a pair of fixed guide pulleys 214 to the other end of which cable is attached a counterweight 216. The slide plate 208 is adjusted verticallyrby mechanism comprising a shaft 218 (see igs. 1, 11, 12 and 13) rigidly secured in a projection 220 on the slide plate 208. The shaft 218 is provided with a series of' comparatively coarse screw threads and is threaded into a rotatable sleeve 222 j ournaled in a bearing in the frame of the machine. The sleeve 222 carries at its u per end a'gear 224 fixed thereto which mes es with an intermediate gear 226 mounted on a stud 228 which in turn meshes with a gear 229 secured tothe u per end of a shaft 230, (see Fig. 10). The s aft 230 which extends vertically through the frame, carries at its lower end a bevel gear 232 meshing with a bevel gear 234 secured to the rear end of a horizontal shaft 236 also journaled in the frame. The shaft 236 carries at its forward end a hand wheel 238 by means of which said shaft may be rotated manually to adjust the grinding wheel. With the above construction, by the rotation of the shaft 236, the sleeve 222 is rotated, thereby adjusting vertically the shaft 218 and the slide plate 208 to which this shaft is secured. Because of the fact that the weight of the slide plate and the parts supported thereon is counterbalanced by the weight 216, he plate may be adjusted vertically very easily and conveniently.

In'addition to the construction providing for the relative adjustment of the rinding wheel and the shaft to be ground, a ove described, provision is also made for adjusting relatively the grinding wheel and the shaft in a direction transverse to the plane of the grindin wheel to locate the splines on the shaft to e ground accurately in central position between the threads on the grinding wheel. In the present machine this adjustment also is effected by adjusting the grinding wheel. In the construction shown (see Fi 4 and 5), the plate 8 is secured to the sli e plate 208 by means of a series of bolts 240 engaging in horizontal slots in the supporting plate 8; The plate 8 is adjusted horizontally by mechanism comprising a slide. To this end the plate shaft 242 journaled in the plate and a gear 244 secured tothe inner end of the shaft and meshing with a rack 246 secured to the slide plate 208. The outer end of the shaft 242 which projects beyond the plate 8 is formed to receive a wrench or other suitable tool by which the shaft may be rotated.

tion for supportin the dead center 26 by which one end of t e shaft to be ground is held during the grinding operation. This construction is adapted to hold the said center firmly in shaft supporting position during the grinding operation, and enables the center to be moved back to release the shaft quickly and easily after the grinding operation is. completed. shown, the dead center 26 is mounted on a slide block 248 arranged to slide on a guide 250 carried by a base member 252 to carry the center 26 toward and from the end of the shaft to be ground. The slide block 248 is acted upon by a coiled sprin 254 which tends to move the slide block to t e left, Figs. 18 and 19, to hold the center 26 in operating position, this spring bein interposed be tween the base 252 and a lock 256 carried Figs. 18, 19 and 20 illustrate the construc-' In the construction by the slide block 248. The movement of the with the base 252 see Fig. 19). The slide block'248 may be moved a ainst the action of the spring 254 or to the rig t, Figs. 18 and 19, by means of a hand lever 264 plvoted at 266 on the work supporting slide and having a pln-and-slot connection with said slide block.

VVed'ge-shaped gibs 267 may be inserted between the slide block 248 and the guide 250 and arranged for adjustment to take up wear. As shown, these gibs are held in place by screws 269.

The base 252 is secured to the work holdin slide by means of a series of screws, the sai base resting upon the upper of two plates 260' and 262. The plates 260 and 262 are secured together, as shown in Fig. 19, the plate 260 resting on the work supporting slide, as shown in this figure. The plate 262 is wedge shaped in cross section, so that the base 252 may be adjusted vertically by a lon-\ gitudinal adjustment of the plates 260 and- 262. Upon loosening the screws which hold the base in position, the plates 260 and 262 may be adjusted by means of an adjusting screw 268 threaded into the base and engaging said plates.

The truin device for truing up the grinding wheel, ifiustrated in Figs. 21, 22, and 23, comprises a truing tool 271 mounted in a holder 270 adjustably secured by a set screw 272 within a support 274. The support 274 is mounted on a slide 276 arranged to slide on a guide 278 secured to the work supporting slide 40, the movement of the slide 276 being transverse to the plane of the grinding wheel.

To enable the slide 276 to be manually adjusted, a rod 280 is threaded at its rear end into a sleeve or bracket 282 secured to the slide. At its'forward end the rod 280 is journaled in projection 284 formed'on the worksupporting slide and the rod is held fromlongitudinal movement by means of a flange 286 on the rod and a collar 288 secured .to the rod. The forward end of the shaft 280 is arranged to receive a crank 290 or other suitable tool for turning the rod.

It isto be understood that the invention is not limited to the particular construction and arrangement of parts of the illustrated embodiment of the invention, but that the invention may be embodied in other forms within the scope of the claims.

\Vhat we claim as new is:

1. A grinding machine for grinding toothed articles having in combination a grinding wheel having a periphery formed to allow the passage of the teeth of a toothed article by a lateral movem nt of the teeth with relation to the wheel w en the wheel is rotated, means for supporting the article in position to be ground with the periphery of the wheel engaged between the teeth of the article, means for rotating the-wheel, and means apart from the grinding wheel itself for relatively moving the wheeland article intimed relation to the rotation of the wheel to carry the wheel over the surface tobe ground and to carry the teeth past the wheel.

2. A grinding machine for grinding toothed articles, havlng in combination a v grinding wheel having a periphery formed to allow the passage of the teeth of a toothed article by a lateral movement of the teeth with relation to the wheel when the Wheel is rotated, means for supporting an article having a series of teeth extendin about the same 4 in position to be ground with the wheel engaged between the teeth of the article and with the axis of the article substantially parallel with a tangent to the wheel, means for rotating the wheel, and means apart from the grinding wheel itself for relatively turning the wheel and article about the axis of the article .in timed relation to the rotation of the Wheel to carry the wheel over the surface to be ground and to carry the teeth past the wheel.

3. A grinding machine for grinding toothed articles, having in combination a grinding wheel having a periphery formed to, allow the passage of the teeth of a toothed article by a lateral movement of the teeth with relation to the wheel when the wheel is rotated, means for supporting an article having a series of teeth extending about the same in position to be ground, with the wheel engaged between the teeth thereof, means for rotating the wheel, means for relatively turning the wheel and article about the axis of the article in timed relationto the rotation of the wheel to carry the wheel over the surface to be ground and to carry the teeth past the wheel, and means for relatively moving sition to be ground with the wheel engaged between the splines, means for rotating the wheel, means for relatively moving the wheel and shaft about the axis of the shaft in timed relation to rotation of the wheel to carry the wheel about the shaft and to carry the splines past the wheel, and means for relatively moving the wheel and shaft longitudinally of the shaft.

' 5. A grinding machine for grinding toothed artlcles, a grinding wheel having a spirally threaded periphery, means for supporting a toothed article in position to be ground with the threads on the wheel engaged between the teeth of the article, means for rotating the wheel, and means apartfrom the grindlng wheel itself for relatively moving the wheel and article in timed relation to the rotation of the wheel to cause the wheel to travel successively from one recess to another between the teeth of the article and to grind successively similar surfaces between the teeth.

6. A grinding machine for grinding toothed art1cles, having in combinationa grinding wheel having a spirally threaded periphery, means for supporting a toothed article having a series of teeth extending about the same in position to be ground, with the threads on the wheel engaging between the'teeth on the article, means for rotating the wheel, and means apart from the grinding wheel itself for relatively rotating the wheel and article in timed relation to the rotation of the wheel to cause the wheel to travel successively from one recess to another between the/teeth on the article and to grind SUCCfiSSlVBlY slmilar surfaces between the teet 7. A grinding machine for grinding toothed articles, having incombination a grinding wheel having a spirally threaded the teeth on the article, means for rotating the wheel, means for relatively rotating the wheel and article about the axis of the article in timed relation to the rotation of the wheel to cause the wheel to travel successively from one recess to another between the teeth on the article, and means for relatively moving the article and wheel longitudinally of theaxis of the article during the grinding operation.

8. A grinding machine havingin combination a grinding wheel having a periphery formed to allow the'passage of the splines of a shaft by a movement of-the splines lat erally of the wheel when the wheel is rotated, means for supporting and rotating the wheel, means for supporting a splined shaft in posi- 'tion to be ground by the wheel, means for moving relatively the grinding wheel and shaft to shift the wheel longitudinally of the shaft, and means apart from the grinding wheel itself for relativelyrotating the shaft and wheel about the axis of the shaft in timed relation to the rotation of the wheel.

9. A grinding machine having in combi-- nation a grinding wheel having a periphery formed to allow the passage of the splines of a shaft by a movement of the splines laterally of the wheel when the wheel is rotated, means for supporting and rotating the wheel, means for supporting a splined shaft in position to be ground by the wheel, means for moving relatively the grinding wheel and shaft to shift the wheel longitudinally of the shaft, and means apart from the grinding wheel itself for rotating the shaft in timed relation to the rotation of the wheel to cause the wheel to grind successively similar surfaces between the splines;

10. A grinding machine having in combination-a grinding wheel having a peripheryformed to allow the passage of the splines of a shaft by a movement of the splines laterally of the wheel, means for supporting and rotating the wheel when the wheel is rotated,

means for supporting a splined shaft in position to be ground by the wheel, means for moving relatively the grinding wheel and shaft to shift the wheel longitudinally of the shaft, means for relatively rotating the shaft and wheel about the axis of the shaft in timed relation to the rotation of the wheel to cause the wheel to grind successively similar surfaces between the splines, and means for relatively adjusting the wheel and shaft to shift the wheel toward and from the axis of the shaft, means for relatively rotating the shaft and wheel in timed relation,to the rotation of the wheel to cause the wheel to grind successively similar surfaces between the splines,

and means for relatively adjusting the wheel and shaft to shift the position of the wheel in a direction transverse to the plane of th wheel.

12. A grinding machine having in combination a grinding wheel having a periphery formed to allow the passage of the splines of a shaft by a movement of the splines laterally of the wheel, means for supporting and rotating the wheel when the wheel ,is rotated,

means for supporting a splined shaft in poof a shaft by a movement of the splines laterally of the wheel when the wheel is rotated, means for supporting and rotating the wheel, means for supporting a splined shaft in positionvto be ground bythe wheel, means for relatively rotating the shaft and wheel in timed relation to the rotation of the wheel to cause the wheel to grind successively similar surfaces between the splines, means for moving the shaft to shift the wheel longitudinally of the shaft, and means for throwing out the shaft moving mechanism to allow the dshaft to be longitudinally adjusted by 14. A grinding maching having in combination a grinding wheel having a periphery formed to allow the passage of the splines of a shaft by a movement of the splines later-- ally of the wheel when the wheel is rotated, means for supporting and rotating the wheel, means for supporting a splined shaft in position to be ground by the wheel, means for relatively rotating the shaft and wheel in timed relation to the rotation of the wheel to cause the wheel to grind successively similar surfaces between the splines, means for moving the shaft to shift the wheel longitudinally of the shaft, means for throwing out the shaft moving mechanism to allow the shaft to be longitudinally adjusted by hand, and mechanism for longitudinally adjusting the shaft by hand.

15. A grinding machine having in combination a7 grindlng wheel having a periphery formed to allow the passage of the teeth of a toothed article by a lateral movement of the teeth 'with relation to the wheel when the wheel'is rotated, means for supporting and rotating the wheel, means for supporting a toothed article in osition to be ground by the wheel, means or relatively moving the article and wheel in timed relation to the rotation of the wheel to'carny the wheel over the surface to'be ground and to carry the teeth past the wheel, and means for relatively adjusting the wheel and article toward or from each other. 1

16. A grinding machine having in combination a grinding wheel having a periphery formed to allow the passage of the teeth of the toothed article by a lateral movement of the teeth with relation to the Wheel when the wheel is rotated, means for supporting and rotating the wheel, means for supporting the the article in position to be ground with the periphery of the wheel engaged between the teeth of the article, means for ro-' tating the wheel, and means for relatively adjusting-the wheel and articles to shift, the position of the wheel with relation to the article in a direction transverseto the plane of the wheel. y,

17. A grinding machine having in combination a grinding wheel having a periphery formed to allow the passage of the teeth of a toothed article by a lateral movement of the teeth with relation to the wheel when the wheel is rotated, means for supporting an article having a series of teeth extending about the same in position to be ground with the periphery of the wheel engaged between,

. the teeth of the article, means for rotating the article in timed relation to the rotation of the wheel to causethe wheel to grind successively similar surfaces between the teeth, and means for throwing out the article rotating mechanism to allow the removal of the article.

18. A grinding machine for grinding toothed articles having in combination a grinding wheel having its periphery cut away at one or more'polnts to allow the passage of the teeth of a toothed article without 1 moving apart the article and wheel when the wheel is rotated, means for supporting the article in position to be ground with the periphery of the wheel engaged between the teeth, of the article, means for rotating the wheel, and means for relatively moving the wheel and article in timed relation to the rotation of the wheel to carry the wheel over shaft and wheel about the axis of the shaft in timed relation to the rotation of the wheel to cause the wheel to grind the valleys be tween the splines without touching the splines.

20.,A grinding machine having in com bination a grinding wheel having a spirally threaded periphery, means for supporting and rotating the wheel, means for supporting a splined shaft in position to 'be ground by the wheel with the splines engaging between the threads 'on-the wheel, means for moving the shaft to shift the-wheel longitudinally of the shaft, and means for rotating the shaft in timed relation tothe rotation of the wheel to cause the wheel to grind the valleys between the splines without touching the splines.

21. A grinding machine for splined shafts having in combination agrinding wheel having a periphery formed to allow the passage of the splines of a shaft by a movement of the splines laterally of the Wheel when the wheel is rotated, means for supporting-and rotating the wheel, means for supporting a splined shaft in position to be ground by the wheel, a longitudinal axis of the shaft being in the plane of the grinding wheel and parallel thereto, means for. reciprocating the shaft longitudinally and means for rotat ing the shaft in timed relation with the rotation of the wheel to cause the wheel to grind successively similar surfaces between the splines.

22. A grinding machine for grinding toothed articles having in combination a grinding wheel having a periphery formed to allow the passage of the teeth of a toothed article by a lateral movement. of the teeth with relation to the wheel when the wheel is rotated, means for supporting the article in position to be ground with the periphery of" the wheel enga ed between the teeth-of the article, means or rotating the wheel,.and'

means for relatively moving the wheel and article in timed relation to the rotation of the wheel to carry the wheel over the surface to be ground and to carry the teeth past the wheel, relative movement of the wheel and article being so timed that the wheel does not come into contact with the sides of the teeth.

23;,A grinding machine for grinding toothed articles having in combination a' grinding wheel having a periphery formed to allow the passage of the teeth of a toothed article by a lateral movement of the teeth'with relation to the wheel when the wheel is rotated, means for supporting a toothed article having a series of teeth extending about the same in position to be ground, with a peripheral portion of the Wheel extendingbetween the teeth thereof, means for rotating the wheel, and means for relatively turning the wheel and article in timed relation to the rotation of the wheel to carry the wheel over the surface to be ground and to carry the teeth past the wheel, rotation of the wheel to carry the wheel over the surface to be ground and to carrythe teeth past the wheel and relative rotation of the wheel and article being so timed that the wheel does not come into contact with the sides of the teeth.

24. In a machine for grindin spline shafts, an abrasive hob provided wit grinding surfaces in the form of a helix with its axis transverse to that of the shaft, and connections to rotate the shaft in unison with the abrasive hob directly as distinct from by, he worm action of the helical grinding surace.

25. In a machine for grinding spline shafts, an abrasive hob havin a grinding surface formed as a helix with 1ts axis transverse to that of the shaft, and connections to rotate the shaft in unison with the hob directly as distinct from by the worm action of the helical grinding surface, and means {.101}; feeding the shaft toward the abrasive 26. In a machine for grinding spline shafts, a driven shaft carrying an abrasive hob having a grinding surface formed as a helix with its axis transverse to that of the shaft, a chuck supporting the splined shaft to be corrected, and connections between the driven shaft and chuck for rotating the latter in unison with the abrasive hob directly as distinct from by the worm action of the helical grinding surface.

27. In a machine for rinding spline shafts, a driven shaft carrymg an abrasive hob having a grinding surface formed as a helix with its axis transverse to that of the shaft, a gear operatively connected to the driven shaft, a chuck rotated by and sliding relatively to the said gear and carrying the splined shaft to be corrected, whereby the peripheral surfaces of the said shaft are successively presented to the abrasive hob.

28. In a machine for grinding spline shafts, a driven shaft carrying an abrasive. hob having a grinding surface formed as a helix with its axis transverse to that of the shaft, a gear operatively connected to the driven shaft, a chuck rotated by the gear in unisonwith the driven shaft and carrying the splined shaft to be corrected, whereby the peripheral surfaces of the shaft are presented in succession to the action of the abrasive hob, and a sliding connection between the gear and the chuck to permit feeding movement of the shaft toward the abrasive hob.

29. In a machine for grinding spline shafts, a driven shaft carrying an abrasive hob having a grinding surface formed as a helix with its axis transverse to that of the shaft, a transversely extending ,shaft geared at one end to the driven shaft, a chuck-rotat surfaces of the shaft to be corrected are presented in succession to the abrasive hob and such shaft is fed forwardly in the grinding operation.

30. In a machine for grinding spline shafts, an abrasive hob provided with a grinding surface in the form of a helix, and a shaft for presenting the work to the hob, the axes of the hob and shaft being arranged transversely with relation to each other, and connections for rotatin the shaft directly in synchronism with the ob, as distinct from rotation by the worm action of the helical grinding surface of the hob.

Signed at Detroit, Michigan this 18th day of December, 1923.

SIDNEY C. PROBERT. FREDERICK J. LAMBORN.

ing gear geared to the other end of the transversely extending shaft, and a chuck rotated by the said gear but slidable relatively thereto, the said chuck su porting the splined shaft to be corrected, whereby the peripheral 

